Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe46810d84dc56a…

MALICIOUS

PDF

77.1 KB Created: 2021-07-01 15:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba446b6f9812714376999286c1dbef49 SHA-1: 9085398d07d0fa0613ea4655ba5742e5d54818d3 SHA-256: 5fe46810d84dc56a97bb1955c72e2f9c2e8b8f05efa90f82fa91eb910dcab965
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute further malicious content. The presence of multiple external URIs and a link farm heuristic indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://polnische-zaune.de/userfiles/file/wikobo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c1c8dc30---nupedorurobovure.pdf
    • http://aihyang.com/userfiles/file/73661435471.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba3bea40d---zaxapimaxavoneza.pdf
    • https://mojer.bg/files/16593574615.pdf
    • https://lasanisports.com/files/4598897272.pdf
    • http://goldnumber.info/userfiles/file/matetudamu.pdf
    • http://kristenpell.com/userfiles/files/mitovifanivasole.pdf
    • http://cn-daomeng.com/upload/userfiles/files/c425ba64608e45aa05e26ad0773b3efe.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d10f98dd7---79621548789.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160999cb41be27---nolofijemilusek.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b86c6fd72---32280630577.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d150819c9c---47286297141.pdf
    • http://jonkmp.nl/img/cms/file/naxixozunasijejevowubag.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/winemibajewatizujifumepu.pdf
    • http://aceonlinementors.com/userfiles/file/vefazigamegelawovutezeruk.pdf
    • https://soosekszer.hu/upload/files/25338584142.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d591edc3a10f53cbeae21ff72b1dc8c7/dovukakuzusevasagavir.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609011b216001---xudun.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b25c212f---wutafifus.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8374e5c40---82394634155.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/psiq170919e5sd6l08na7gjppr/mikirux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=western+county+court
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd82.bin
1a8e4891c94e02cc900a8c47f6af5cab2b55144fecfa5615e306ec03714cb11d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 10132 bytes
font_01_sfnt_off0000e45f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 16792 bytes
font_02_sfnt_off0000fc71.bin
41df7e363bc78a3dead7d5759076a51396744bfa43e65026fb4c8b3dceeff20a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 16484 bytes